161611101616005 has 12 divisors (see below), whose sum is σ = 280125909467820. Its totient is φ = 86192587528512.

The previous prime is 161611101615961. The next prime is 161611101616057. The reversal of 161611101616005 is 500616101116161.

It is a happy number.

161611101616005 is a `hidden beast` number, since 1 + 6 + 1 + 611 + 10 + 16 + 16 + 0 + 0 + 5 = 666.

It can be written as a sum of positive squares in 2 ways, for example, as 30437189694081 + 131173911921924 = 5516991^2 + 11453118^2 .

It is not a de Polignac number, because 161611101616005 - 2¹⁰ = 161611101614981 is a prime.

It is a super-2 number, since 2×161611101616005² (a number of 29 digits) contains 22 as substring.

It is a congruent number.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (23) of ones.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 1795678906800 + ... + 1795678906889.

It is an arithmetic number, because the mean of its divisors is an integer number (23343825788985).

Almost surely, 2^{161611101616005} is an apocalyptic number.

161611101616005 is a gapful number since it is divisible by the number (15) formed by its first and last digit.

It is an amenable number.

161611101616005 is a deficient number, since it is larger than the sum of its proper divisors (118514807851815).

161611101616005 is a wasteful number, since it uses less digits than its factorization.

161611101616005 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 3591357813700 (or 3591357813697 counting only the distinct ones).

The product of its (nonzero) digits is 6480, while the sum is 36.

The spelling of 161611101616005 in words is "one hundred sixty-one trillion, six hundred eleven billion, one hundred one million, six hundred sixteen thousand, five".